<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test suite</title>

    <script>

        //测试分组断言
        (function () {
           var results;
           this.assert = function assert(value,desc){
               var li = document.createElement('li');
               li.className = value?'pass':'fail';
               li.appendChild(document.createTextNode(desc));
               results.appendChild(li);
               if(!value){
                   li.parentNode.parentNode.className = 'fail';
               }
               return li;
           };
           this.test = function test(name,fn) {
               results = document.getElementById('results');
               results = assert(true,name).appendChild(document.createElement('ul'));
               fn();
           }
        })();
        window.onload = function () {
            test('A test.',function () {
                assert(true,'First assertion completed');
                assert(true,'Second assertion completed');
                assert(true,'Third assertion completed');
            });
            test('Another test',function () {
                assert(true,'First test completed');
                assert(false,'Second test failed');
                assert(true,'Third assertion completed');
            });
            test('A third test',function () {
                assert(null,'fail');
                assert(5,'pass')
            })
        };

    </script>

    <style>
        #results li.pass{
            color: green;
        }
        #results li.fail{
            color: red;
        }
    </style>
</head>
<body>
<ul id="results"></ul>
</body>
</html>